Malicious PDF — malware analysis report

Static analysis result for SHA-256 e852a2ba40744c65…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 09:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 946471f8fca41eca682b3e9773bb9ed2 SHA-1: 19ecd02a02e74cbfabc9cdd203bea1a2b59fd529 SHA-256: e852a2ba40744c65c8150af4810bf33754afbb86af0af5ddf23d770978d3b501
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading unwanted software or visiting malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=free+tv+channels+apk PDF link annotation
    • https://pet-fashion.ro/mm/file/23523521410.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/10090670747.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/60732653702.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/14013319780.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/48824107580.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///temopinosimupiwuzuf.pdfIn PDF document text
    • http://coffee33.ru/archive/file/xofawivilufedanisilefaxu.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/89002955640.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109121554161431.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/xefugenavuduwere.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/kuvir.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210904_EB23A83607FC3584.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/kezonafasaporozuxoduse.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210908044722.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a806f42df2---16151300940.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/89680093205.pdfIn PDF document text
    • http://origo.ws/userfiles/file/65543385287.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/63096496010.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140a858dc7a9---71177269437.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630770312_2f68ce48fb.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/32553708798.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210901065251.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 17016 bytes
SHA-256: b8485c459cf94fa70118131a94b4c94bc9cf07c66e24b390aba130b62f71ea35
font_02_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 10392 bytes
SHA-256: 025f578ec4e5b222ac964710d079627e83e4e5ad04266c9577939544add185a2

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